Just when it seemed GPS tracking technology couldn t get any better SportDOG has again changed the game with the introduction of the TEK 2.0 Tracking System. In terms of range accuracy and reliability the TEK 2.0 Tracking System surpasses every other system on the market. Preloaded full-color topo maps keep you on course while the system provides feedback on your dog s location or even up to 21 dogs simply by adding additional collars (TEK-2L) to the system. How does SportDOG do it? With features that prove this is the pinnacle of tracking perfection.